Repeat control mechanism for cash registers and accounting machines



Dec. 5, 1961 1.. E. ZURBUCHEN ETAL REPEAT CONTROL MECHANISM FOR CASHREGISTERS AND ACCOUNTING MACHINES Filed Jan. 8, 1958 6 Sheets-Sheet 1INVENTORS LOUIS E. ZURBUCHEN 8| FRANK R. WERNER BY W THEIR ATTORNEYSDec. 5, 1961 L. E. ZURBUCHEN ET AL REPEAT CONTROL MECHANISM FOR CASHREGISTERS AND ACCOUNTING MACHINES Filed Jan. 8, 1958 6 Sheets-Sheet 2INVENTORS LOUIS E. ZURBUCHEN a FRANK R. WERNER BY W THEIR ATTORNEYS Dec.5, 1961 L. E. ZURBUCHEN ETAL 3,011,699

REPEAT CONTROL MECHANISM FOR CASH REGISTERS AND ACCOUNTING MACHINESFiled Jan. 8, 1958 6 Sheets-Sheet 5 INVENTORS LOUIS E. ZURBUCHEN 8:FRANK R. WERNER yfl 'm f g g M THEIR ATTORNEYS AL 3,011,699 ASHREGISTERS HINES Dec. 5, 1961 E. ZURBUCHEN ET REPEAT CONTROL MECHANISMFOR 0 AND ACCOUNTING MAC Filed Jan. 8, 1958 6 Sheets-Sheet 4 FIG.9

REGISTE;

LOCKED REGISTER INVENTORS BUGHEN a RNER THEIR ATTORNEYS Dec. 5, 1961 L.E. ZURBUCHEN ET AL REPEAT CONTROL MECHANISM FOR CASH REGISTERS ANDACCOUNTING MACHINES Filed Jan. 8, 1958 6 Sheets-Sheet 5 INVENTORS LOUISE. ZURBUCHEN 8 FRANK R. WERNER THEIR ATTORNEYS Dec. 5, 1961 Filed Jan.8, 1958 L. E. ZURBUCHEN ET AL REPEAT CONTROL MECHANISM FOR CASHREGISTERS AND ACCOUNTING MACHINES 6 Sheets-Sheet 6 INVENTORS FRANK R.WERNER QQM 4 m M; %n M.

THEIR ATTORNEYS LOUIS E.ZURBUCHEN a I,

United States Patent 3,011,699 REPEAT CONTROL MECHANISM FOR CASH REG-ISTERS AND ACCOUNTING MACHINES Louis E. Zurbuchen and Frank R. Werner,Dayton, Ohio, assignors to The National Cash Register Company,

Dayton, Ohio, 'a corporation of Maryland Filed Jan. 8, 1958, Ser. No.707,774 7 Claims. (Cl. 235-11) This invention relates to cash registersand accounting machines and is particularly directed to means forcontrolling the amount-repeating mechanism of such machines.

One object of this invention is to provide means to control theamount-repeating mechanism of cash registers and accounting machines toinsure proper operation thereof and thus to prevent maloperation of themachine and the possibility of damage to the machine mechanism resultingtherefrom.

Another object is the provision of means to prevent operation of themachine when said machine is not properly conditioned for either anamount-repeating operation or an amount-non-repeat operation.

Still another object is to provide means to prevent operation of themachine when a control key is retained in operated condition at the endof either a repeat operation or a non-repeat operation, or when saidcontrol key is operated prior to the end of such operations.

A further object is to provide means to prevent operation of the machinewhen certain control keys remain in operated condition at the end of arepeat operation and an attempt is made to condition the machine for anamount-non-repeating operation or a totalizing operation.

With these and incidental objects in view, the invention includescertain novel features of construction and combinations of parts, apreferred form or embodiment of which is hereinafter described withreference to the drawings which accompany and form a part of thisspecification.

In the drawings:

FIG. 1 is a right side elevation of the machine taken just to the rightof one of the amount banks, showing said bank and the differentialmechanism associated therewith for transmitting the data set up on theamount keys to the printing and indicating mechanisms and to theselected totalizers.

FIG. 2 is a right side elevation taken just to the right of the Row 2transaction or control keys, showing the control mechanism of said bankand a part of the coupling pinion operating and controlling mechanism.

FIG. 3 is a detail view of the coupling pinion supporting and operatingmechanism.

FIG. 4 is a detail view showing a portion of the repeat disablingmechanism and means for resetting said disabling mechanism.

FIG. 5 is a detail view of the mechanism actuated by certain controlkeys for controlling the repeat mechanism.

FIG. 6 is a detail view of the mechanism actuated by a particularcontrol key for controlling the repeat mechanism.

FIG. 7 is a detail view of the total control lever and means associatedtherewith for controlling the repeat mechanism.

FIG. 8 is a fragmentary detail view of the zero stop mechanism for oneof the amount banks.

FIG. 9 is a diagrammatic plan view of the keyboard of the machineembodying the present invention.

FIGS. 10 and 11 are detail views of the repeat control mechanism,showing said mechanism in position to free 3,011,699 Patented Dec. 5,1961 the machine-releasing means for operation, to initiate a repeatoperation.

FIGS. 12 and 13 are detail views showing the repeat control mechanismsof FIGS. 10 and '11 in position to free the machine-releasing mechanismfor operation to initiate a non-repeat operation.

FIGS. 14 and 15 are detail views showing the repeat control mechanism inposition to block operation of the machine-releasing means when a Row 2control key is retained depressed at the end of a repeat operation.

FIG. 16 is a detail view showing the repeat control mechanism and themanner in which it functions to obstruct operation of themachine-releasing mechanism when a Row 2 control key is retaineddepressed at the end of a non-repeat operation.

FIG. 17 is a detail view showing the manually-operable key release leverand the mechanism operated thereby for moving the obstructing meansshown in FIG. 16 to ineffective position, so that the machine-releasingmechanism is free to operate.

FIG. 18 is a right side elevation of the Row 2 control keys and themechanism associated therewith for initiating operation of the machine.

FIG. 19 is a right side elevation of the key release lever shown in FIG.17 and the mechanism associated therewith for rocking the key lock andrelease line from its central or home position in a restoring directionto release any inadvertently depressed amount or control keys.

The machine chosen to illustrate the present invention has many basicprinciples and features, similar to those of a well-known type of cashregister, which is fully disclosed in the following United Statespatents: No. 1,816,263, issued July 28, 1931; No. 1,929,652, issuedOctober 10, 1933; No. 2,048,200, issued July 21, 1936; and No.2,056,485, issued October 6, 1936, all to William H. Robertson.

Reference may be had to the above-listed patents for a history of thedevelopment of the pioneer machines of this type and for a completedisclosure of mechanism used in the present machine which is similar tothe corresponding mechanism of the pioneer or basic machines, and whichfor that reason will be described only in gen eral terms in the presentapplication.

Likewise, the machine embodying the present invention is practicallyidentical in its appearance and in many of its structural details to themachines disclosed in the co-pending applications for Letters Patent ofthe United States, Serial No. 341,633, filed March 11, 1953, by Frank R.Werner, Kenneth C. Flint, and Walter G. Sterzer which issued into UnitedStates Patent No. 2,880,- 930, April 7, 1959 and Serial No. 412,464,filed February 25, 1954, by Frank R. Werner and Kenneth C. Flint, whichissued into United States Patent No. 2,962,209 on November 29, 1960, andto which patents reference may be had for a full disclosure of similarmechanism, which is illustrated in the present application and whichwill be described only in general terms unless it has a direct bearingon the present invention.

Machine in General The mechanism of the subject machine is supported byright and left side frames, only the left frame 101 being shown here(FIG. 1), and by corresponding auxiliary frames (not shown) secured tothe upper ends of said right and left frames, which latter are in turnsecured at their lower ends to a machine base plate 102. The base plate102 rests in and is secured to a shallow pan (not shown) in turn securedto the top surface of a drawer base (not shown), which base contains oneor more cash drawers (not shown), which open automatically at the end ofcertain machine operations and which 3 may be opened manually byauthorized persons having a key to the right-hand closure of a machinecase or cabinet (not shown). The cabinet encloses the mechanism of themachine and is constructed of suitable ma terial, such as sheet metal orplastic, and said cabinet is secured at its lower edge to the machinebase plate 102 by suitable screws, which engage threadedholes in saidbase plate. The right and left side frames are maintained in properspaced-apart relation-ship to each other by the base plate 102, by aback plate 119 (FIG. 1), se cured between said side frames, and byvarious cross bars, plates, rods, and shafts.

The details of construction of the machine framework are not shown herebut are fully disclosed in the previ-.

ously mentioned applications, Serial No. 341,633, now Patent No.2,880,930, and Serial No. 412,464, now

Patent No. 2,962,209.

action or control keys 104 to 108 inclusive, a Row 2 of transaction orcontrol keys 109 to 113 inclusive, a

row of Clerks keys 114, and a key release lever 115 for I releasing anydepressed keys prior to operation of the machine. The keyboard of themachine also includes a total control lever 116, often refer-red to as aUnit Lock Lever, which is movable to various positions to control thedifferent functions of the machine, said positions including Register,Locked Register, Read Row 1, Reset Row 1, Read Row 2, and Reset Row 2positions. The total control lever 116 (FIGS. 7 and 9) has incorporatedtherein a lock 117, provided with two or more keys (not shown), one ofwhich permits said lever to be locked in either Register position orLocked Regis- V ter position, so that said lever may not be moved out ofthese positions by unauthorized persons not in possession of said key.

The total control lever 116 is normally locked against movementintoeither Reset Row 1 or Reset Row 2 position, and the second key is aspecial reset key which, in cooperation with the lock 117, unlocks saidtotal control lever, so that it' may be moved to either of its resetpositions. This makes it impossible for persons not in possession of aresetkey to move the total control lever to either of its resetpositions for the purpose of clearing the amounts from any of thetotalizers on the No. 1 and No. 2 totalizer lines.

Each of the rows of amount keys 103 (FIGS. 1 and 9) has associatedtherewith a corresponding amount differential mechanism, which causesthe amount set up on said keys to be entered into the selected totalizerand positions the corresponding front and back indicato r s 118 (FIG.1), only one front indicator being shown here. Likewise, the Row 1 andRow 2 control keys 104 to 113 inclusive have associated therewithcorresponding transaction differential mechanisms for positioningcorresponding front and back transaction indicators (not shown)according to the dispressed key, to indicate visibly the kind oftransaction being performed. The front and back indicatorsare visiblethrough corresponding openings in the upper portion of the machine caseor cabinet.

In addition to positioning the indicators, the amount differentialmechanisms and the transaction differential mechanisms positioncorresponding type wheels for printing values corresponding to thedepressed amount keys .and for printing identifying characters orsymbols,

corresponding to the effective control keys, upon a detail audit strip(not shown) and upon an issuing receipt (not shown) or, if desired, uponan insertable slip (not shown). The Clerks keys 114 also are providedwith a differential mechanism for positioning corresponding type wheelsfor printing identifying characters upon the record material. Themechanism for printing records upon the record material is not disclosedherein but is fully disclosed in the previously-mentioned United Statesapplication Serial No. 341,633, new Patent No. 2,880,930.

The machine is normally driven by the usual type of small electricmotor, not shown here but disclosed in the application Serial No.341,633, now Patent No. 2,880,- 930; however, in emergencies the machinemay be operated manually by means of a hand crank (not shown),

which is inserted through an opening provided therefor in the machinecase. A rockable shutter (not shown) normally closes the opening for thehand crank.

The present machine is provided with two lines of interspersedtotalizers (FIG. 1), and in the present adaptation the No. 1 line, whichis controlled by the Row 1 control keys 104 to 108 inclusive (-FIG. 9),has four sets of interspersed totalizer wheels thereon, and the No. 2totalizer line, which is controlled by the Row 2 control keys 109 to 113inclusive, has five sets of interspersed totalizer wheels thereon, saidtotalizer lines being shiftable laterally under control of theircorresponding control keys to align the selected set of totalizer wheelsthereon with the amount differential mechanism for actuation thereby.Likewise, the control keys, in conjunction with the total control lever116, control the engaging and disengaging movements of the selectedtotalizer with and from the differential mechanism for entering amountsinto said selected totalizer wheels and for the taking of totalstherefrom. Each totalizer line is provided with a tens transfermechanism for transferring tens digits from lower to higherdenominations.

In the ensuing pages, mechanism pertinent to the present invention willbe described in detail.

Detailed description-Amount keys and difierential mechanism therefor Asexplained previously, the present machine is provided with five rows ofamount keys 103 (FIG. 9), and each row of amount keys is provided with acorrespond ing differential mechanism for transferring the value of thedepressed key to the indicating and printing mechanisms, and for settingthe selected set of totalizer wheels in accordance with the value ofsaid depressed amount key. Inasmuch as the five amount banks are similarin construction, it is believed that a description of the amount bankillustrated in FIG. 1, as representative of all the amount banks, willbe suflicient.

The amount keys 103 (FIGS. 1 and 9) are slidably supported incorresponding slots in a key frame removably attached to the machine bymeans of rounded notches in opposite ends thereof, which engagecorresponding cross rods 126 and 127 supported by the machine framework.The rod 126 is undercut to form a flat surface which permits the keyframe 125 to be removed from the machine when said rod is turnedcounterclockwise substantially ninety degrees from the position in whichit is shown in FIG. 1. The turning of the rod 126 moves its undercutportion into position to provide clearance for the inner edge of theupper notch in the frame 125, thus permitting said frame to be rockedforwardly, or counter-clockwise, out of engagement with said rod andthen to be lifted off of the lower rod' 127. Each key 103 is urgedupwardly to undepressed position by a corresponding compressible spring128 (FIG. 1), which springs encircle the lower ends of the stems of saidkeys and are confined between shouldersformed on said keys, adjacent thestems, and a finished arcuate surface formed in the frame 125. Each ofthe amount keys 103 (FIG. 1) carries a stud 129, which coacts with acorresponding hook on a locking detent 130 mounted for swinging movementon the inner ends of parallel links 131 and 132, in turn pivoted onstuds 133 and 134 secured in the frame 125. A spring 135 urges thelocking detent 130 inwardly, or to the right (FIG. 1), to normallymaintain the angular camming nose on the hook of said detent in yieldingengagement with its corresponding stud 129 in the key 103.

Depression of any one of the amount keys 103, in the denominationalorder being described, causes the stud 129 therein, in cooperation withthe angular nose on the corresponding hook, to shift the detent 130downwardly as the links 131 and 132 rock clockwise. This moves a lowersurface, on a downward extension 136 of said link 132, into the path ofan ear 137 on an arm 138, secured on a key lock and release shaft 139,journaled in the machine framework, to block releasing movement of saidarm and said shaft in a clockwise direction, when an amount key 103 ispartially depressed. Full depression of an amount key moves a flat uppersurface on the stud 129 beyond the shoulder of its corresponding hook tofree the detent 130to the action of the spring 135, which immediatelyreturns said detent upwardly a slight distance to latch the shoulderformed on said hook over the flat surface on the stud, to retain saidamount key in depressed position against the action of the spring 128and to restore the link 132 sufficiently counter-clockwise to move theextension 136 out of the path of the ear .137.

Release of the machine for operation frees the shaft 139 and the arm 138for clockwise releasing movement (FIG. 1), causing the ear 137 to moveinto the path of an arcuate surface formed on the extension 136 toobstructdownward movement of the locking detent 130 and thus to lock thedepressed amount key 103 in depressed position and simultaneously lockthe undepressed amount keys in this row against depression duringmachine operation. Near the end of each machine operation, the shaft 139and the arm 138 are restored counterclockwise, in the manner disclosedin the application Serial No. 341,633, now Patent No. 2,880,930, causingthe outer surface on said arm 138 to engage a stud 140 in the link 132and rock said link clockwise to shift the detent 130 downwardly againstthe action of the spring 135 to disengage the shoulder on the hook ofsaid detent from the stud 129 of the depressed amount key 103, to freesaid key to the action of its spring 128, which immediately restoressaid key upwardly to undepressed position. The depressed amount key 103may be released prior to machine operation by the manual operation ofthe key release lever 115 (FIGS. 9 and 17), which rocks the shaft 139and the arm 138 counterclockwise a slight distance from their normalpositions, as shown in FIG. 1, to release the depressed amount key, inthe manner explained above.

The lower ends of the stems of the amount keys 103 (FIG. 1) are arrangedto cooperate with a projection 145 on a corresponding primarydifferential member 146, which, with its associated secondarydifferential member 148, is rotatably supported in adjacent relationshipon a shaft 147 journaled in the main frames of the machine. The primaryand secondary differential members are actuated by a leading rod or bail149 (FIG. 1) supported between two similar arms 150 (only one shownhere) secured on the shaft 147, said rod passing through and coactingwith a curved slot 151 in the primary member 146 and with acorresponding curved slot 152 in the secondary member 148. The rod 149oscillates first clockwise and then back to normal position (FIG. 1) toactuate the differential mechanism during each cycle of machineoperation.

The secondary differential member 148 (FIG. 1) has, on its periphery,gear teeth which mesh with corresponding teeth in an intermediate gear153 free on a shaft 154 supported in the machine framework. The gear 153meshes'with teeth in the periphery of a segmental transmission gear 155,having internal teeth which bear on the periphery of a disk 156supported by a shaft 157 in turn supported by the main frames 100 and101. The internal teeth of the segment 155 (FIG. 1) mesh with a pinion158 mounted on a square shaft 159 rotatably supported by disks similarto the disk 156. Other pinions on the shaft 159 mesh with and drivesegments similar to the segment 155, which segments in turn drivecorresponding type wheels (not shown) for printing records on an issuingreceipt, on an audit or detail strip, and, in some cases, upon aninsertable slip. The transmission gearing comprising theinternal-external segment 155, the pinion 158, the shaft 159, andcorresponding pinions and segments driven by said shaft constitutes theKreider type of transmission mechanism, which is well known in the art.

Large teeth 160 in the upper periphery of the segment 155 (FIG. 1) meshwith a corresponding pinion 161, integral with the corresponding frontindicator 118, free on a shaft 162 supported by the indicator framework.The front indicator 118 is visible through an aperture in the front ofthe machine case or cabinet, while a companion back indicator (notshown) is visible through an aperture in the back of said cabinet and ispositioned in unison with the corresponding front indicator by means ofthe pinion 158, the shaft 159, and corresponding pinions and segments(not shown) in the well-known and usual manner.

After the primary differential member 146 (FIG. 1) has been positionedunder influence of the depressed amount key 103, and after the secondarymember 148 has been restored to zero position, as will be explainedpresently, the two members are clutched together for unitary positioningmovement by a clutch or coupling pinion 170, free on a rod 171 (FIGS. 1,2, and 3) supported by three parallel arms 172. Two of the arms 172 arefixedly secured to a sleeve 169 in turn free on a shaft 173 journaled inthe machine framework, while the third arm 172 is free on a reducedportion of a sleeve 168 (FIG. 2), in turn free on the shaft 173. Thecentral arm 172 (FIG. 3) has pivotally connected thereto the upper endsof two rrns 174 and 175. The upper surface of a notch 176 in the arm174, and the lower surface of a notch 177 in the arm 175, are positionedto cooperate with the corresponding surfaces on a stud =178 mounted in acam lever 179 (FIG. 2), free on a shaft 180 supported in the machineframework and carrying rollers 181 and 182, which coop erate with theperipheries of companion plate cams 183 and 184- secured on a main camshaft 185 journaled in the machine framework and driven one clockwiserevolution (FIG. 2) each machine operation. A second stud 186, fixed inthe lever 179, cooperates with a notch 187 in the arm 174, to guide themovement of said arm. A spring 188 (FIG. 3) urges the arm 175counter-clockwise to normally retain the lower surface of the notch 177in coacting relationship with the lower surface of the stud 178. Aspreviously explained, depression of one of the amount keys 103 moves thelower end of its stern into the path of the projection 145 of theprimary differential member 146. After this, the machine may be releasedfor operation by depression of the appropriate one of the control keys104 to 113 inclusive (FIG. 9).

Using the Produce key 110 (FIGS. 9 and 18) as an example of all of thecontrol keys, the pin 273 in said key 110 coacts with the correspondingone of several curved cam slots 1189 in a release control plate 1190rockably supported in the control key framework by being pivotallyconnected to the inner ends of two similar links 1192, only one shown,the outer ends of said links being pivotally supported on stationarystuds 1193 secured in the control key framework. A spring 1191 urges thecontrol plate 1190 rearwardly or clockwise to maintain extensions,formed on the outer or left-hand well of the cam slots 1189, in yieldingcontact with the pins 273. An inward extension formed on the lower endof the control plate 1190 (FIG. 18) carries a stud 1194, which engages aslot in a release pawl 1195, rotatably supported on the shaft 173. Aforward extension 1197 of the pawl 1195 coacts with a stud 1198 securedin the upper end of a release arm 1199 secured on the keylock andrelease shaft 139.

Depressing the Produce key 110 (FIG. 18) causes the stud 273, incooperation with the cam slot 1189, to shift ment of the shaft 139, thearm 1199, and the stud 1193 moves said stud above and in the 'path of acurved surface 1200, formed on the upper edge of the extension 1197, toretain the pawl 1195 and the control plate 1190 in theircounter-clockwise or released positions, whereupon the slot 1189,coacting with the stud 273 in the depressed key 110, retains said key ina depressed position against the action of its restoring spring 128 forthe duration of machine operation.

Near the end of machine operation, the release shaft 139, the arm 1199,and the stud 1198 are restored counterclockwise from tripped positionthrough home posilines in FIG. 18, to move said stud 1198 beyond thesurface 1200 to free the pawl 1195 and the control plate 1190 forrestoring movement, whereupon the spring 1191 restores said partsupwardly or clockwise to normal position, said spring 1191 beingassisted by the spring 128, which at the same time restores thedepressed key 110 upwardly to undepressed or normal position.

A rather simple mechanism, associated with the releasing mechanism, isprovided for preventing unintentional repeat cycling of the machine.This mechanism includes a non-repeat pawl 1201 (FIG. 18) free on theshaft 173 and flexibly connected to the release pawl 1195 by a spring1202, which urges said pawls toward each other to normally maintain astud 1203, carried by said pawl 1201, in yielding engagement with theupper edge of said release pawl 1195. The outer end of the non-repeatpawl .tion to full restored position, indicated by dot-and-dash 1201extends beyond the end of the release'pawl 1195 and overlies the stud1198 in the arm 1199.

Downward lor counter-clockwise movement of the release pawl 1195, upondepression of one of the motorized control keysfor example, the Producekey 110- as explained before, carries the non-repeat pawl 1201counter-clockwise in unison therewith until the outer end of said pawl1201 comes to rest on top of the stud 1198 in the arm 1199, after whichthe outer end 1197 of said release pawl 1195 moves beyond said stud 1198torelease the machine for operation in the manner explained before.

In case the control key 110 is retained depressed,

either unintentionally or otherwise, at the end of machine operation,the release controlplate 1190 and the release pawl 1195 are retained intheir counter-clockwise or downward positions, and therefore cannotreturn upwardly or clockwise when the shaft 139 and the arm 1199 arerestored counter-clockwise near the end of machine operation, asexplained before. Full restoring movement counter-clockwise of the shaft139 and the arm 1199 moves the stud 1198 beyond the outer end of thenonrepeat pawl 1201, whereupon the spring 1202 moves said pawlcounter-clockwise into the path of said stud 1198 to obstruct releasingmovement of the arm 1199 and the shaft 139, thereby preventing a repeatcycle of the machine.

When pressure is removed from the key 110, the control plate 1190 andthe release pawl 1195 are springrestored upwardly in the mannerexplained before, during which restoration said pawl 1195 engages thestud 1199 are immediately spring-returned a slight distance clockwisefrom full restored position to their normal or home positions, asdetermined by said stud 1198'engaging the extension 1197 of the releasepawl 1195.

At the beginning of machine operation, the cams 183 and 184, (FIGS. 1,2, and 3) cause the lever 179 and the arm to rock the arms 172 and therod 171 clockwise, to disengage the teeth of the clutch pinion 170 fromthe corresponding teeth of the primary and secondary diiferentialmembers 146 and 148. Coincidentally with the disengagement of the pinion170, the teeth of said pinion are engaged with a correspondingaligning'tooth 189 (FIG. 1) on an arm 190 secured on a shaft 191supported by the machine framework, to maintain said teeth in alignmentwith the corresponding teeth of the diiferential members to eliminateany danger of theteeth clashing or stumbling on each other upon engagingmovement of said pinion with said differential members.

Immediately after the clutch pinion 170 has been disengaged, the rod 149(FIG. 1) starts its initial movement clockwise, and the primarydifferential member moves in unison therewith under influence of acomparatively strong spring 192, which normally maintains the rear endof the slot 151, in said primary member, in yieldingengagement with saidrod 149. The rod 149 and the primary diiferential member 146 moveclockwise in unison until the projection 145 strikes the inner end ofthe depressed amount key 103, thus terminating clockwise movement ofsaid primary diiferential member and positioning it in accordance withthe value of the depressed key. The leading rod 149 continues itsinitial clockwise movement independently of the primary differentialmember, during which movement it engages the forward end of the slot 152in the secondary differential member 148 and carries said member and themechanism connected thereto, including the corresponding indicators andtype wheels, from their preset positions to a normal, or zero, position.

After the primary differential member has been positioned, and after thesecondary differential member has been restored to normal, or zero,position, as explained above, the clutch pinion 170 (FIG. 1) isreengaged with the teeth in said primary and secondary members to conplesaid members together with unitary movement. In its counter-clockwisereturn movement, the rod 149 (FIG. 1) engages the rear end of the slot151 in the primary differential member- 146 andcarries said member and,through the clutch pinion 170, the secondary difierential member 148eounter-clockwise in unison therewith, to return said primary membertonormal, or zero, position, as shown in FIG. 1, and to position thesecondary member 148 and the mechanism connected thereto in accordancewith the value of the depressed amount key103.

When the machine is operatedwith. no amount key 103 depressed in theamount bank being described, a zero stop bar 193 (FIGS. 1 and 8) isautomatically moved into the path of the projection 145 at the beginningof machine operation, and retains the primary differential member 146 inzero position, and said primary member in turn positions thesecondary'differential member 148 and the corresponding indicators andtype wheels in "zero position. Depression of an amount key 103 causesthe zero stop bar 193 to be; latched in ineifective position, so that itwill not be moved into the path of the projection 145; V f

The inner end of the zero stop bar 193 (FIGS. 1 and 8) is guided in aslotin the frame 125, while its outer end is slotted to embrace the stud134 in said frame 125. A spring 194 urges the bar 193 inwardly tonormally maintain a stud 195 (FIG. 8), carried thereby, inyieldin'gcontact with an' upward extension of a zero stop bar control arm 196free on the shaft 191 and having a'slot 197, which engages a stud 198 inthe arm 138. Clockwise totalizer wheels 217 mounted thereon.

releasing movement of the shaft 139 and the arm 138 causes the stud 198to move down into a clearance portion of the slot 197 to free the arm196 and the zero stop bar 193 to the action of the spring 194, whichimmediately shifts said bar inwardly to the dot-and-dash-line positionshown in FIG. 1, into the path of the projection 145 to hold the primarydifferential member 146 in zero position when no amount key 103 isdepressed. The primary differential member then positions the secondarydifferential member 148 and the corresponding indicators and type wheelsin accordance with the zero positioning of the primary member.

Depression of an amount key 103 (FIG. 1) causes the stud 129 therein, incooperation with the corresponding camming lug on a control plate 199rockably supported by an upper link 205 and a lower link 200 pivoted onthe studs 133 and 134, respectively, to shift said plate 199 downwardlyagainst the action of a spring 201.

' Downward movement of the plate 199 shifts the link 200 alsodownwardly, or clockwise, to latch a curved slot 202 in a hook-shapedrearward end thereof over a stud 203 (FIGS. 1 and 8) in the zero stopbar 193, to retain said bar in its ineffective position, so that theprimary differential member 146 may be positioned by the depressedamount key 103. Counter-clockwise restoring movement of the arm 138,through the stud 198 coacting with the slot 197, causes the arm 196 torestore the zero stop bar 193 outwardly, against the action of thespring 194, to normal position, as shown here in full lines. Insub-totaltaking and total-taking operations, often referred to herein asreading and resetting operations, mechanism is provided for retainingall of the zero stop bars 193 for the amount banks in their outward, orineffective, positions, so that the primary differential members 146 arefree to be positioned under influence of the wheels of the selectedtotalizer as said wheels are reversely rotated to zero position by saidprimary differential members.

Totalizers As previously mentioned, the present machine is provided withtwo lines of interspersed totalizer wheels, including a No. l totalizerline 216 having four sets of totalizer wheels 215 (FIG. 1) mountedthereon, and a No. 2 totalizer line 218 having five sets of interspersedThe No. l and No. 2- totalizer lines are shiftable longitudinally toaline the selected sets of totalizer wheels 215 and 217 with the primarymembers 146, and said lines are also shiftable inwardly and outwardly toengage and disengage the teeth of the selected totalizer wheels with andfrom the corresponding teeth in the periphery of said primarydifferential members, for actuation thereby. The construction andoperation of the mechanisms for selecting the totalizers and forengaging and disengaging the selected totalizers are not described inthe present application but are fully disclosed in the applicationSerial No. 412,464,

now Patent No. 2,962,209, to which reference may be had if a detaileddescription thereof is required.

Aliners for differential and indicator mechanisms Aliner mechanisms areprovided for the segments 155 and for the corresponding indicators 118,to aline said parts after they have been positioned under influence ofthe corresponding keys in adding operations or under influence of thecorresponding totalizer wheels in totalizing operations.

Thetransmission segment 155 for the amount differential mechanism, usedhere as representative of all the amount differentials, has aliner teeth228 arranged to be engaged by an aliner bar 229 supported on threesimilar arms 230 (only one shown here) secured on a shaft 231 journaledin the machine framework. Also secured on the shaft 231 is a crank 232pivotally connected by a link 233 to one arm of a bell crank 234 free ona rod 235 supported by the machine framework. The other arm 10 of thebell crank 234 is pivotally connected by a link 236 to a downward arm ofa cam lever 237 free on the shaft 180 and carrying rollers 238 and 239,which coact, respectively, with the peripheries of companion plate cams240 and 241 secured on the main cam shaft 185.

Operation of the cams 240 and 241 engages the aliner bar 229 with theteeth 228 of the segment 155, after said segment has been positionedunder influence of the differential mechanism and prior to operation ofthe printing mechanism, to insure that said parts are held in setpositions. After the printing mechanism has operated, and after theselected set of totalizer wheels has been disengaged from the primarydifferential member 146, the aliner bar 229, assisted by a spring 242,is disengaged from the teeth 228, said spring being tensioned betweenthe link 233 and a stud in the back plate 119, which spring yieldinglymaintains said bar in disengaged position at the end of machineoperation.

The pinion 161 for the indicator 118 for the amount differentialmechanism, shown in FIG. 1, is normally engaged by the tooth of anindicator alining pawl 243 secured on a shaft 244 journaled in theindicator framework. The shaft 244 is urged counter-clockwise by aspring 245 tensioned between a stationary stud (not shown) and an arm246 secured on said shaft 244. Also secured on the shaft 244 is a crank247 pivotally connected by a link 248 to a rearward arm of a bell crank249 (FIG. 1) free on the rod 235. Movement of the bell crank 249 isoperatively controlled by a plate cam (not shown) secured on the maincam shaft 185. As fully disclosed in the application Serial No. 341,633,now Patent No. 2,880,930, operation of said plate cam first causes thealiner pawl 243 to be rocked clockwise, against the action of the spring245, out of engagement with the pinion 161 at the beginning of machineoperation, to free the indicator 118 for positioning under influence ofthe differential mechanism, in the manner explained before. After theindicator 118 has been properly positioned, said cam permits the spring245 (FIG. 1) to re-engage the tooth of the pawl 243 with the pinion 161to aline and retain the indicator 118 in set position during the remainder of the cycle of machine operation.

Repeat mechanism The present machine is provided with a novel mechanismfor repeating the amount of a previous transaction without foreknowledgeon the part of the operator that such amount is to be repeated. Theamount of a previous transaction may be repeated in a subsequenttransaction, snbject to the conditions that no amount key be depressedin said transaction, and that the proper control key be depressed toinitiate a repeat operation. This type of repeat mechanism isparticularly useful in connection with self-service or supermarketcheck-out systems, where the operator may be required to successivelycheck a number of similar items of the same price, such as cartons ofmilk, canned goods, bars of soap, etc., by initiating successive repeatoperations by depressing the proper transaction key for each repeatoperation.

Obviously it is not the intention to limit the repeat mechanism to acheck-out system, or to any particular business system, for that matter,for it is apparent that said repeat mechanism may be used to advantagein connection with many other business systems.

As stated previously, the coupling pinion (FIGS. 1, 2, and 3) is movedin and out of mesh with the primary and secondary differential members146 and 148 'by the companion cams 183 and 184. Means is provided fordisconnecting the members supporting the pinion 170 from the camfollowing lever 179, so that said pinion will remain engaged with thedifferential members at the beginning of machine operation. In thisevent, if no amount key is depressed, and the proper transaction orcontrol key is depressed to initiate an amountrepeating operation, theprimary differential member 146 Will move with and be positioned by thecorresponding secondary differential member 148 as the latter isrestored to normal or zero position by the leading rod 149 at thebeginning of machine operation, and thus the setting of the primarydifferential member, under influence of the de pressed amount key in theprevious non-repeat operation, will be duplicated, to repeat the amountin the succeeding operation.

The arm 175 (FIGS. 2 and 3) has a slot engaged by a stud 261 in thelower end of an arm 262 secured to one end of the sleeve 163, which, aspreviously explained, is free on the shaft 173. Secured on the other endof the sleeve 168, in fixed relation to the arm 262, is an arm 263having a notch 264, which embraces a stud 265 secured to a lever 266free on the shaft 147. A second stud 267 on the lever 266 is arranged tocoact with a surface 268 formed by a cut-out portion in a detent 269rockably mounted between the two rows of transaction keys, by a lever316 pivoted between said detent and a stud 317, and by a slot in saiddetent, which engages a stud (not shown), said studs being secured inthe machine framework. The detent269 (FIG. 2) is provided with aplurality of upstanding fingers 270, each finger having cam surfaces 271and 272, arranged to coact withcorresponding studs 273 secured in thestems of the Row 2 transaction keys-109, 110, 111, and 112,

respectively, and in the Grocery key 106.

When any one of the above-mentioned transaction or control keys isdepressed, without an amount key 103 having been previously depressed,the stud 27 3 in the stem of such key will coact with the cam surface271 of the corresponding finger 270 to shift the detent 2'69counterclockwise, or downward, as viewed in FIG. 2. This causes thesurface 268 on the detent 269 to engage the stud 267 and shift the lever266 counter-clockwise about the shaft 147, which in turn imparts aclockwise movement to the arms 263 and 262 about the shaft 173, thusrocking the arm 175 sufiiciently clockwise to move the lower surface ofthe notch 177 therein (FIGS. 2 and 3) out of operative relation with thestud 178 on the lever effective to disengage the coupling pinion 170from the differential members 146 and 148, thus causing said members toremain clutched together for unitary movement, upon operation of theleading rod 149. Clockwise movement of the arm 175, as described above,moves a stud 274, carried thereby, into engagement with the curved upperedge of a retaining member 275 (FIG. 2) secured in the machineframework, to retain the arms 172 against movement, thus preventingaccidental disengagement of the pinion 170 from the differential members146 and 148, because of gravity or other factors, such as vibration orjarring of the machineg It will be recalled that at the end of machineoperation the secondary differential member 148 (FIG. 1) is leftstanding in the position to which it was adjusted under control of thedepressed amount key 103, and that the primary differential member 146is always returned to its home or zero position. In repeat operations,the secondary differential member 148 is used for controlling thepositioning of the primary differential member 146. As no amountkeys 103are depressed in repeat operations, the primary differential member 146will move clockwise under initial movement of the leading rod 149 andcarry the secondary differential member 148 in unison therewith untilstopped by means other than an amount key. This means consists of a stopsurface 276 (FIG. 1), formed on the secondary differential member 148,which surface moves into engagement with the periphery of the gear 153and thus stops said secondary differential member 148 in its zero orhome position. In repeat operations, the arm 175 (FIGS. 2 and 3) isdisconnected from the lever 179, and therefore, when the machine startsto operate, the coupling pinion 179 will not be disengaged from'thedifferential members 146 and 148, and

the stud 274, coacting with the retaining member 275,

will hold said pinion in positive engagement with said differentialmembers. Therefore, restoration of the secondarydiiferential member 148to its zero position will simultaneously position the primarydifferential member 146 according to the value standing on saidsecondary member at the end of the preceding operation, thereby settingup in said primary member the amount previously standing on'saidsecondary member 148. During the return movement of the rod 149, thecoupling pinion 176 remains engaged with the primary and secondarydifferential members; therefore, member 146 will be returned to its homeposition, and member 148 will be returned to the position in whichit wasstanding at the beginning of the repeat operation.

It is to be understood that the differential mechanisms forall' theamount banks function in exactly the same manner as described above forthe amount bank shown in FIG. 1, which is used as representative of allsaid amount banks.

During a repeat operation, the corresponding wheel of the selectedtotalizer is engaged with and disengaged from the primary differentialmember 146 in exactly the same timing as for any other adding operation,and therefore the amount previously standing on the secondarydifferential member 148 will. again be added into the correspondingtotalizer wheel. Simultaneously, the indicators and the type carrierswill be adjusted in the same manner as described before for an addingoperation.

Referring to FIGS. 2 and 3, it will be seen that the arm'175 isconnected to and operates only the coupling pinions for the amount banksand has no effect upon the coupling pinions for the Row 1 and Row 2transaction or control keys and the row of Clerks keys 114. The couplingpinions 170 for the two control rows and the Clerks bank are rotatablysupported on arms (not shown) secured to the shaft 173, and saidshaft'is operatively connected to companion plate cams (not shown)secured on the main cam shaft 185. At the beginningof each cycle ofmachine operation, the coupling pinions 170 for the Clerks bank and thetwo control rows are disengaged from their corresponding primary andsecondary differential members, re-engagement of said pinions beingeffected after proper positioning of said primary differential members.The differential mechanisms for the two transaction banks and for theClerks bank are controlled in repeat operations in the same manner as ina regular or normal adding operation.

As previously explained, in a repeat operation, the primarydiffer'entialvmember 146 for the amount bank being described is movedunder, control of its'corresponding secondary member 148, and for thisreason it is necessary to retain the zero stop bar 193 forsaid bank outof effective position during repeat operations. In adding operations,depression of an amount key causes the associated zero stop bar 193 toberetained in ineffective position; however, in repeat operations, noneof the amount keys are depressed, and therefore other means must beprovided for retaining the zero stop bars'in ineffective position, sothat the corresponding primary differential members are free to bepositioned under control of the corresponding secondary differentialmembers, to repeat the amount of the previous operation.

- It will be recalled, by referring to FIGS. 2 and 9, that depression ofany one of the control keys 106, 10 9', 110, 111, or 112 for initiatinga repeat operation shifts the detent 269 downward, thus rocking thelever 266 counterclockwise about the shaft 147. A forward extension 285(FIGS. 2 and 5) of the lever 266coacts with a stud 2% fast in an arm291-free on the shaft 139. The arm 29 1 is connected to a companion arm(not shown) also pivoted on the shaft 139 by rods 292. Counter-clockwiserocking of the lever 266, upon depression of one of the above-mentionedcontrol keys, rocks the arm 291 also counterclockwise, to move therearward rod 292 into the path of a shoulder 293 (see also FIG. 8)formed on the arms 196 for each amount bank. This obstructs clockwisemovement of the arms 196 and thereby retains the zero stop bars 193 intheir ineffective position, so that the primary differential members 146are free to be positioned under the control of the secondarydifferential members 148 as said members 148 are being reversely rotatedto zero in repeat operations. Similarly, the zero stop bars 193 arelocked in ineffective position during read and reset operations bymechanism not shown here but fully disclosed in the previously-mentionedUnited States application Serial No. 341,633, now Patent No. 2,880,930.

. Also free on the shaft 139, and secured in fixed relationship to eachother by the rods 292, are a series of arms 294 (FIG. 8), one for eachamount bank, the upper ends of which arms 294 are arranged to cooperatewith downward extensions 295 on the corresponding control plates 199 foreach bank. A spring (not shown) urges the arms 291 and 294 clockwiseabout the shaft 139.

Depression of the appropriate control or transaction key rocks the arms291 and 294 counter-clockwise about the shaft 139, in the same manner aspreviously explained, and thereby moves the upper ends of said arms 294into the' paths of the corresponding extensions 295 to lock the amountkeys 103 against depression'when no amount key 103 has previously beendepressed. Likewise, de-

pression of an amount key 103 shifts the corresponding plate 199 (FIGS.1 and 8) down to move the extensions 295 into the paths of the upperends of the corresponding arms 294 to obstruct counter-clockwisemovement of said arms 294 and 291.

It will thus be seen that, when the proper transaction key has beendepressed to initiate a repeat operation, the control plates 199 in theamount banks will be locked against movement, and therefore no amountkey can be depressed. It will also be understood that, when an amountkey 103 has been depressed, the consequent movement ofthe extension 295on the corresponding plate 199 will prevent counter-clockwise rotationof the farms 291 and 294 and will consequently, through the stud 290,prevent counter-clockwise rotation of the lever 266.

Repeat mechanism disabling means It is necessary that no amount keys 103be depressed in repeat operations; therefore, mechanism is providedwhereby depression of an amount key 103 renders the repeat mechanisminoperable.

Depression of an amount key 103 shifts the control plate 199 downward(FIG. 1), which in turn causes the link 205 to be rocked clockwise aboutthe stud 133. An extension 300 (FIGS. 1 and 4) of the link 205 coactswith a rod 301, secured between two links 477 and 303 (FIGS. 4 and 5),each of which is pivotally mounted on a stud 304 secured in axialalinement in a correspondingplate 305, in turn secured on the shaft 157and properly spaced apart, so that one of said plates 305 is adjacentthe segment 155 for the first amount bank and the other is adjacent saidsegment 155 for the second amount bank. Clockwise rocking of the link205, upon depression of an amount key, through the extension 300,

rocks the links 477 and 303 and the rod 301 counterclockwise (FIGS. 1and 4) against the force of a spring 306, which is connected to said rodand to a member 307 i secured to a sleeve 308 free on a shaft 309mounted in 14 connecting the link 315 to said arm 314. The arms 313 and314 are urged clockwise (FIG. 4) by the spring 306.

The rocking of the link 303, upon depression of an amount key, moves thesurface 311 out of engagement with the car 312 to free the arms 313 and314 for clockwise rotation under influence of the spring 306. Thismovement is transmitted through the link 315 and the lever 316 (FIG. 2)to the transaction detent 269, to shift said detent upwardly, thuspositioning the cam surfaces 272 in the path of movement of the studs273 in the transaction keys 106, 109, 110, 111, and 112.

With the detent 269 in its upward position, depression of one of theabove-recited transaction keys shifts said detent farther upwardly, inrelation to the shaft 147, and retains it thus, to render said detentineffective to shift the lever 266 (FIGS. 2 and 3), and therefore thelower surface ofthe notch 177 on the arm 175 will be retained in thepath of the stud .178. The companion cams 183 and 184 will, therefore,remain effective to disengage the coupling pinions from thecorresponding sets of primary and secondary differential members 146 and148 at the beginning of each machine operation,- and a repeat operationwill not be performed when an amount key is depressed.

Means are provided for disabling the repeat mechanism upon depression ofany of the total-taking control keys 105, 107, or 108, and by depressionof the Paid-Out key 104, as will now be explained.

As shown in FIG. 5, a detent 288, free on the shaft 147, has fingers 345with cam surfaces 346 adapted to coact with the studs 273 in thetransaction keys 105, 107, and 108. The detent 288 has, in its upperend, a notch 347 arranged to coact with a stud 348 secured in one arm ofa lever 349 pivotally mounted on a stud 350 secured in the machineframework, and said lever 349 is urged counter-clockwise by a spring351. A stopstud 352, secured in the machine framework, limits thecounter-clockwise movement of the lever 349.

Depression of the Sub-Total, Tax Total, or Cash Total keys 105, 107, or108, respectively, causes the stud 273 in such depressed key to coactwith its corresponding cam surface 346, to shift the detent 288counter-clockwise, or downwardly (FIG. 5), which in turn rocks the lever349 clockwise. Clockwise movement of the lever 349 causes a surface 353thereon to engage the rod 301 and rock said rod and the links 477 and303 counter-clockwise (FIGS. 4

and 5) to disable the repeat mechanism in exactly the same manner asdescribed above. Counter-clockwise shifting of the detent 288 causes adownward extension 289 to coact with the stud 290 to retain the zerostop bars 193 for the amount banks in ineffective position in the mannerpreviously. described. As explained before, depression of an amount key103 obstructs counter-clockwise movement of the arms 294 and 291 (FIGS.5 and 8), which, through the stud 290, prevents counter-clockwisemovement of the detent 288 to prevent depression of the keys 105, 107,or 108.

As shown in FIG. 6, the Paid-Out key 104 is provided with a separatedetent 354 having a finger 355 with a cam surface 356, which coacts withthe stud 273 in said key 104. The detent 354 also has a notch 357, whichcoacts with the stud 348 in the lever 349. This construction isnecessary for the Paid-Out key 104, since this key, unlike theSub-Total, Tax Total, and Cash Total keys, is used in clockwise, or tothe left (FIG. 6), which in turn rocks the lever 349 clockwise todisable the repeat mechanism in exactly the same manner as explained forthe keys 105, 107 and 108.

The total control lever 116 is provided with means for disabling therepeat mechanism when said lever is moved out of Register position.

to a shaft 361 journaled in they machine framework. Also pinned to theshaft 361 is an arm 363, provided with a control surface 364 having alow portion 365, said control surface arranged to coact'with a stud 367in a lever 366 pivotally mounted on a stud 368 in a plate 369, similarto the plates 305, and fixed on the shaft 1-57. The lever 366 isprovided with a slot through which the rod 301 extends with ampleclearance to preclude interference between said rod and said lever.wardly-extending 'finger .1382, arranged to coact with a stud 383 in therepeat-mechanism-disabling lever 349. The spring 351 (FIG. 7) urges thelever 349 counterclockwise, causing the stud 383, coacting with thefinger 1382, to urge the lever 366 clockwise, to normally maintain thestud 367 in yielding engagement with the controlsurface 364.-

When the total control lever 116 is in Register position,

relationship with the stud 367, and consequently the lever 366 is heldin the position shown here, in which it does not affect the operation ofthe disabling lever 349. However, when the totalcontrol lever 116 isshifted in either direction out of Register position, a high portion ofthe control surface 364 coacts with the stud 367 to rock the lever 366counter-clockwise, which in turn rocks the lever 349 clockwise todisable the repeat mechanism in the manner explained before.

Fast on the shaft 361 is an arm 362 (FIG. 2), carrying a stud 374engageable with a curved extension of a link 375 free on a stud 376secured to the machine framework and pivotally connected to one end of adetent 377, said detent connected at its other end to a. link 378 freeon a stud 379 secured in the machine framework. The detent 377 isnormally .urged in a rearward direction by a spring 380, and said detenthas, near its lower end, a notch 381, engageable with a stud 382 securedto the zero stop bar 277 for the Row 1 control bank.

Moving the total control lever 116 (FIGS. 7 and 9) to either Read Row 2or Reset Row 2 position rocks the shaft 361 and the arm 362 (FIG. 2)counter-clockwise, causing the stud 374, coacting with the curvedextension of the link 375, to shift the detent 377 downward to engagethe notch 381 with the stud 382 on the zero stop bar 277. Thispositively retains the zero stop bar 277 in inefiective position duringa Read Row 2 or Reset Row 2 operation, thus permitting'the differentialmembers (not shown) for Row 1 toposition other mechanism (not shown), soas to render inoperative a locking means (not shown) which wouldotherwise lock the total control lever 116 in Read Row 2 or Reset Row 2position for succeeding machine operations. Inalike manner, depressionof any Row 1 control key shifts the detent 377 downward to retain theFormed on the lever 366 is a for- 1 zero stop bar 277 for Row 1 inineffective position, as

Mechanism is provided for resetting the repeat disabling means at theend of each cycle of machine operation.

Itwill be remembered that the sleeve 308, on which the repeat disablingarms 313 and 314 are secured, is freely supported on'the shaft 309. Alsofree on the shaft 309, between the sleeve 308 and the left frame 101, isa sleeve (not shown) having secured thereto an arm 392 (FIG. ,4) with-asurface 393 arranged to coact with a stud 394 fast in an arm 395 securedon the sleeve 308. A yieldable link 396 pivotally connects the arm 392to a crank 397 free on a shaft 398 supported by the machine framework,said crank being normally urged counter-clockwise by a 9 spring 399. Theyieldable link 396 comprises two members 400 and 401 slidably connectedto each other by studs 40 2 and 403 carried thereby, in cooperation withslots in the. associated member, said studs having tensionedtherebetween a spring '404, which normally maintains the link 396 at itsmaximum length. The crank 397 is pivotally connected by a link 405 to arestoring arm 406 free on a stud 407 fast in the machine framework. Thearm 406 has a surface 408 arranged to coact with the shaft to limitdownward movement of said arm. The. arm 408 has a cam surface 409. (FIG.4), which coacts with a stud 410 carried by a drive gear 411 for themain cam shaft 185, said gear being connected to said shaft by a hub 412thereon, which is pinned to said shaft. The gear 411 drives the main camshaft through one full clockwise revolution, as viewed in FIG. 4, eachcycle of operation, and near the end of each operation the stud 410contacts the cam surface 409 on the arm 406 and rocks said arm clockwiseabout its pivot '407. This motion is transmitted, through the link 405,the crank 397, and the yieldable link 396, to the arm 392 andcauses'said arm to rock counter-clockwise about the shaft 309.

It will be recalled, by referring to FIG. 4, that, in a non-repeatoperation, depression of an amount key causes the link 303 to be rockedcounter-clockwise about its pivot 304 to disengage the car 312 from thesurface 311, thus permitting the arm 313, the sleeve 308, and the arm395 to rock clockwise under influence of the spring 306, until suchmovement is terminated by the stud 394'coming into yielding contact withthe. surface 393 on the arm 392. The counter-clockwise rocking movementimparted to the arm 392v by the stud 410, as explained above, istransmitted to the arm 395 by coaction of the surface 393 with the stud394, because the spring 404 is stronger than the spring 306.Counterclockwise rocking of the arm 395, the sleeve 308, and the arm 313will restore these parts to normal repeat position, as shown in FIG. 4,and the spring306 will then rock the link 303 clockwise a slightdistance to engage the surface 311 with the ear 312 to retain said arms313, 314, and 395 and the sleeve 308 in said restored position. During arepeat operation, the arms 313, 314, and 395 will be retained in thepositions in which they are shown in FIGS. 2 and 4 by the surface 311and the ear 312, and therefore the counter-clockwise rocking of the arm392 will have no effect upon these parts. The yieldable construction ofthe link 396 prevents any possible jamming of the machine mechanismandpossible damage resulting therefrom, in case the arm 392 andconnected mechanism are inadvertently held against restoring movement bythe retention of a Row 2 control key in depressed condition at the endof a non-repeat operation. I 1

By reference to FIGS. 2 and 4, it will be seen that if in a non-repeatoperation the operator, through inadvertence, were to hold down one ofthecontrol keys 106, 109, 110, 111, or 112 at the end of machine op- Veration, the detent 269 will be shifted to and held in a position to theright, or, rearwardly of the position in which itis shown in FIG. 2.This movement of the detent 269 acts through the lever 316 and the link315 to shift the arms 313, 314, and 395 and the sleeve 308 clockwise totheir non-repeat positions, and to hold said parts in such position. Inthis event, the arm 392 would be blocked from rocking counter-clockwise,as viewed in FIG; 4, as the stud 410 rocks the arm 406 clockwise nearthe end of machine operation. To preventstraining or breaking of theparts of the machine under the above circumstancemthe yieldable link 396shortens, if necessary, against the. action of the spring 404, to absorbthe action of the restoring mechanism.

Mechanism for preventing repeat of a totalizing-or paid-out operation aMechanism is provided for latching the repeat disabling means ineffective position to prevent a repeat operation from being performedimmediately following a total-taking operation or a paid-out'operation.

Thedownwardly-extending arm of the repeat disabling lever 349 (FIG. hasa flat surface 422 normally engaged by the nose of a hook 421 formed ona latch 420 pivoted on a stud secured in the machine framework. A spring423 urges the latch 420 counter-clockwise (FIG. 5) to normally maintainthe nose of the hook 421 in yielding engagement with the surface 422, asshown here. The latch 420 has a surface 424 arranged to cooperate with astud 425 secured in the upper end of a lever 426 pivoted on a stud 427in the detent 288. The extent of movement of the lever 426 is limited bya slot 428 therein, in cooperation with a stud 429 secured in the detent288. The lever 426 has in its lower end a stud 430 engaged by a notch431 in the end of an upward extension 432 (FIGS. 2 and 5) of thecoupling pinion arm 333.

It will be recalled that, in Paid-Out, Sub-Total, Cash Total, or TaxTotal operations, the movement of the detent 354 or 288 (FIGS. 5 and 6),upon depression of the appropriate control key, rocks the lever 349clockwise to disable the repeat mechanism. This shifts the lower end ofthe lever 349 out of engagement with the nose of the hook 421, thusfreeing the latch 420 to the action of the spring 423, which moves saidhook 421 into the path of the downward extension of the lever 349 toobstruct counter-clockwise rotation of said lever out of repeatdisabling position. Since the lever 349 is retained in repeat disablingposition during the remainder of machine operation, the link 303 (FIG.4) is also held in its repeat disabling position against restoringmovement clockwise and therefore cannot engage the car 312 when the arm313 is restored counter-clockwise by the repeat resetting mechanism, asexplained above. There fore, since the arm 313 is not held in resetposition, as shown in FIG. 4, the arm 314 (FIG. 2) is free to shift thedetent 269 back to its non-repeat position,in which the cam surfaces 272are in the path of movement of the studs 273 in the transaction keys.The lever 349 is held in its non-repeat position by the latch 420 duringa portion of the next following machine operation until after the cams183 and 184 (FIG. 2) have imparted counter-clockwise movement to the arm179 for disengaging the amount clutch pinions 170 from the correspondingamount diiferential members 146 and 148. At the same time, the arm 333and its extension 432, for the Row 2 clutch pinion 170, then receiveclockwise movement, as viewed in FIGS. 2 and 5, causing the lever 426 torock counter-clockwise, whereupon the stud 425 engages the surface 424to rock the latch 420 clockwise, against the force of the spring 423.This disengages the hook 421 from the downward extension of the lever349 and frees said lever to the action of the spring 351, whichimmedaitely rocks said lever counterclockwise into engagement with thestop stud 352. When the lever 426 is later returned clockwise, the stud425 moves idly in the enlarged or cut-out portion of the latch 420,adjacent the surface 424.

It should be noted that the disengagement of the latch 420 takes placeprior to release of the depressed transaction key and the consequentfreeing of the detent 288, Which occur near the end of machineoperation.

It should, therefore, be evident that, if a Paid Out, Sub-Total, TaxTotal, or Cash Total operation is performed, the repeat disabling lever349 will be retained in its effective repeat disabling position by thenotch 347 in the detent 288, or by the notch 357 in the detent 354(FIGS. 5 and 6), and the latch 420 will, therefore, again engage thelever 349 to retain it in repeat disabling position upon being freed tothe action of the spring 423 by return movement clockwise of the lever426. On the other hand, if the operation being performed is not a PaidOut, Sub-Total, Tax Total, or Cash Total operation, the detents 288 and354 will be in the positions shown in FIGS. 5 and 6, and the lever 349will be free to move under influence of the spring 351 into ineffective18 or repeat enabling position, as shown here, upon being released bythe latch 420.

The above-described repeat mechanism is fully disclosed and claimed inLetters Patent of the United States No. 2,941,714, issued June 21, 1960,to Frank R. Werner and Louis E. Zurbuchen, inventors, to which patentreference may be had for a more detailed description of mechanism whichis described herein in a general way.

Control mechanism for repeat mechanism It was believed at the time theabove-described repeat mechanism was developed that the usual controlmechanism operating between the Row 1 and Row 2 control keys, and themachine-releasing mechanism, and disclosed principally in FIG. 18 ofthis application and-in FIGS. 4 and 12 of the application Serial No.341,633, now Patent No. 2,880,930, and the description in connectiontherewith, would provide adequate and safe control of the machinecycling functions in repeating and non-repeating operations.

However, upon further testing and extended use of the repeat mechanism,it was found that the usual control mechanism failed under severeconditions of operation, due principally to the closeness in timingbetween the operation of the releasing mechanism for the depressed Row 1or Row 2 control key and the restoring of the key lock and release line139 (FIG. 18) and the consequent restoring of the release pawl 1195 andthe nonrepeat pawl 1201. This failure of the usual control mechanismresulted in serious mal-function of the repeat mechanism, and,toovercome this undesirable condition,

the control mechanism of the present application was developed as anadjunct operating in unison with, but independently of, the usualcontrol mechanism, to prevent mal-operation of the machine in repeatingand non-repeating operations. The control mechanism of the presentapplication has proven to be an adequate and satisfactory solution tothe problem of proper control of the machine cycling functions in repeatand non-repeat operations.

Referring to FIGS. 1, 10, and 12, the machine release and key lock line139 has secured thereon an arm 450 carrying a stud 451, which engagesand coacts with a notch in a downward extension of a lever 452 pivotallysupported on a stud 453 secured in the main left frame. The lever 452carries a stud 454 pivotally supporting an arm 455 with a bent-oversensing finger 456 arranged to sense a control surface comprising a highportion 458 and a low portion or notch 459 on the downward end of acontrol arm 460 free on a stud 461 secured in the main left frame. Thearm 460 carries a stud 462, which extends into and cooperates with a camslot 463 formed in a downward extension of a lever 464 rotatably mountedon a stud 465 securedin the main left frame. A link 466 pivotallyconnects the upper end of the lever 464 to an arm 467 secured on thesleeve 308 in fixed rela tionship to the arm 313, said sleeve being freeon the shaft 309. 7

Further control is provided for releasing movement of the shaft 139 bymechanism which positions the finger 456 of the arm 455 in relation tothe control surface on the arm 460 (FIGS. 10 and 11).

The finger 456 extends into and coacts with a slot 470 in a downwardextension of an arm 471 free on the stud 461. The arm 471 carries a stud472, which engages and coacts with a cam slot 473 in a lever 474 free onthe stud 465'. The lever 474 is pivotally connected by a link 475 to anupward extension 476 of a link 477, rotatably supported on one of theaxially-alined studs 304 carried by the plates 305, and engaging theshifting rod 301 for unitary movement with said rod, the link 303 andother parts connected to said rod. As previously explained, the machineis normally conditioned for an amount-repeating operation, and underthese conditions the arm 460 (FIG. 10) is positioned, as shown here, bythe arms 313 and 467, which are retained in clockwise of the shaft 139and the arm 450, and therefore the machine is free for operation.

Depression of an amount key 103 (FIGS. 1, l0, and

l l) rocks the link 205 clockwise, causing its extension 300, incooperation with the rod 301, to rock said rod and the links 303 and 477counter-clockwise to disengage the surface 311 on the extension 310 fromthe car 312;, to

freethe arm 313, the arm 467, and the sleeve 308 for immediate clockwisemovement under springtension, as shown in FIGS. 12 and 13. Clockwisemovement of the arm 467 (FIG. 12), through the link 466, rocks the lever464 counter-clockwise, causing the slot 463, cooperating with the stud462, to rock the arm 460 counter-clockwise, from the position shown inFIG. to the position shown in FIG. 12. Likewise, counter-clockwisemovement of the link 477, upon depression of an amount-key, as explainedabove, through the extension 476 and the link 475, rocks the lever 474also counter-clockwise, causing the cam slot 473, coactingwith the stud472, to impart counter-clockwise movement to the arm 471. This causesthe slot 470 to move the finger 456 into alinement with the undercutportion 459 of the control surface on the arm 460, as shown in FIG. 12,so that releasing movement clockwise of the shaft 139 and the arm 450 isnot obstructed, and the machine is free to operate when an amount key'isdepressed as an incident to a non-repeat operation.

If a Row 2 control key 109 to 112 inclusive, or the Grocery key 106, isinadvertently or accidentally retained depressed at the end of a repeatoperation, or is depressed prior to the end of'said repeat operation(FIGS. 1, 2, and 9), the stud 273, coacting with the correspondingsurface 271 on the detent 269, will hold the arm 313 in untripped orrestored position, as shown in FIGS. 14 and 15, at the end of suchoperation, and in this case depression of an amount key 103, as anincident to a non-repeat operation, will rock the link 303 and the arm471 counterclockwise to move the finger 456 into the path of theobstructing surface 458 on the arm 460, to obstruct releasing movementof the shaft 139, so that under this condition and upon failure of thenon-repeat pawl 1201 (FIG. 18) to function properly, the machine may notbe released for operation unless and until the inadvertently-depressedcontrol key is released and restored to *undepressed position,thusfreeing the arm 313 and connected parts for spring-actuated trippingmovement to aline the notch 459 with the finger 456 (FIG; 12), so that anon-repeat (adding) operation. may be performed.

Likewise it is desirable that the machine be locked against operation ofthe Sub-Total key 105 is depressed to initiate a reading operation whenone of the keys 109 to 112, or the key 106 is inadvertently retainedpartially de- 2a depressed and the non-repeat pawl 1201 (FIG, 18) failsto function properly. I

- In the above case, retention of the detent 269 i]: its repeat orcounter-clockwise position causes the coupling pinions'170 (FIGS. 2 and3) to remain engaged with theircorresponding primary and secondarydifferential members. This defeats. the purpose of a sub-'total-takingoperation and would cause mal-operation of the machine and possibledamage to the machine mechanism, as it is necessary that the couplingpinions 170 be disengaged at" the beginning of a sub-total operation, atwhich time the wheels of the totalizer being sub-totalized are engagedwith the primary differential members and are reversely rotated byinitial movement of said members until the long teeth on said wheelsstrike fixed stops, which locate said wheels in Zero position and.position the primary differential members accordingly. If" it werepossible to.

operate the machine in sub-total or total-taking time with the couplingpinions170 engaged, the secondary differential members then becomepositive drivers for the corresponding primary differential membersandwould drive said members and, in this case, the corresponding engagedtotalizer wheels positively in a reverse direction.

If, during this positive driving movement of the totalizer wheels, thelong teeth thereon would come into contact with the. zero stops, it isquite probable that said teeth would be broken off, or other mechanismof the machine, including the differential mechanism, strained or forcedout of proper alinement, thus causing mal-functioning of the machine insubsequent operations. However, it is the a function of the repeatcontrol mechanism, described above, to render improper operations suchas this impossible, thereby protecting the machine against mal-operationand possible damage.

What has beenfsaid above concerning the Sub-Total key 105 appliesequally as well to the Tax Total key 107 and the Cash Total key 108(FIGS. 5 and 9) In non-repeat (adding) operations, tripping of the arm313 (FIGS. 2 and 4), by depressionof an amount key,

.plained before, to non-repeat position.

If one of the Row 2 keys 109. to 112 inclusive, or the Grocery key 106,were retained depressed at the end of a non-repeat operation, ordepressed just prior to the end of such operation, the detent 269 andconnected mechanism, including the arm 313, would be'retained in theirtripped or non-repeat positions, and operation of the re- Storingmechanism, shown in FIG. 4, would have no effect in restoring said partsto their untripped position,

due to the yieldable construction ofthe link 396, which,

pressed at the end of an immediately-precedingrepeat operation, or ispartially-depressed prior to the-end of said repeat operation.

In this case, depression of the Sub-Total key 105 causes the stud 273(FIG. 5) to rockthe Row l'detent 288 counter-clockwise,which, throughthe lever 349, rocks'the rod 301 and the links 303 and 477counterclockwise (FIG. 15), which,through theextension 47.6

. the link 475', and the lever 474; causes thearm 471. to

move the finger 456 into the path of the obstructing 'surface 458 on thearm 460, as shown in FIG. 14, to prevent release of the machine for asub-total-taking operation when one of the control keys mentioned aboveis partially V as explained before, operates to restore said mechanismto tion.

The obstruction of restoring movement of the arm 313 (FIGS. 12, .13, and16) would, through the ear 312, in

untripped position near the end of each machine operacoop'er'ation withthe extension 310 of the link 303, also l obstruct-restoring movement ofsaid link, which, through.

the arm 471, would retain the finger 456 in alinement with the'undercutfnotch 459 of the arm, 460, so that, upon. failure of thenon-repeat pawl 1201 (FIG. 18) to function properly, themachine-releasing mechanism would be free to operate, unless otherwiseprevented, and

a mal-operation would be the result. Retaining the arm 313 andconnectedmechanism, including the lever 464,-in

tripped position, as explained above, causes a cam surface 479 (FIG.'l6) on said lever 464, incooperation with a 'stud 480inthe upper end ofa pawl 481 free on a stud 482 securedin the leftmain frame, to free'saidpawl to a the action of'aspring 483, which is tensioned to rock saidpawl clockwise. Extreme, or full, clockwise restoring movement of thelever 452 (FIG. 16), near the end of machine operation, moves a surface485 on the inner end of said lever beneath a downward extension 484 ofthe pawl 481, whereupon the spring 483 immediately rocks said pawlclockwise into the path of said surface to retain said lever 452, arm450, and shaft 139 in their normal or home positions, to preventimproper operation of the machine.

In some cases, due to accumulated tolerances or lost motion in theparts, the shaft 139 may move clockwise (FIG. 18) slightly beyond homeposition, thus permitting the stud 1198 to move over or above thesurface 1200 sufficiently to block restoring movement of the plate 1190and the depressed control key, upon release of pressure on saiddepressed key.

Before the machine can be operated again, it is necessary to restore theshaft 139 counter-clockwise and to simultaneously move the pawl 481 outof engagement with the surface 485', and this is accomplished bymanipulation of the key release lever 115 (FIGS. 9, 16, and 17).

The key release lever 115 (FIGS. 17 and 19) is piv otally supported on astud 486 secured in the machine framework. A spring 1490 urges saidlever 115 clockwise to normally maintain a downward extension thereof inyielding engagement with a rubber bumper 1491 bonded to a bracket inturn secured to the total control lever 116 to form a shock-reducingstop for the control lever 115 and connected parts. A link 1492 (FIG.19) pivotally connects the lever 115 to a restoring lever 1493 pivotedon a stud 1494 secured in the machine framework.

Moving the key release lever 115 counter-clockwise in a key-releasingdirection, through the link 1492, rocks the lever 1493 clockwise,causing an arcuate cam surface 1495 thereon to engage a roller 1496carried by an arm 1497 secured on the release shaft 139, to rock saidarm and said shaft counter-clockwise from normal or home position tofully restored position, as indicated in dot-anddash lines in FIG. 19.Restoring movement counterclockwise of the shaft 139 and the arm 1199frees the release pawl 1195 (FIG. 18) and the control plate 1190 forreturn movement to normal position, under influence of the spring 1191,which in turn frees the depressed control key for return movementupwardly to undepressed position, under influence of its spring 128.Counter-clockwise releasing movement of the release lever 115 (FIG. 19)and connected parts is limited by means of a finger 1498, formed on theupper end of the link 1492, in cooperation with a stop stud 1499,secured in said release lever 115. Tripping movement clockwise of therelease shaft 139 and the arm 1497 causes the roller 1496 (FIG. 19) tomove beneath an arcuate locking surface 1500, formed on the lever 1493,to secure said lever and the release lever 115 against operation whilethe machine is cycling.

' Moving the key release lever 115 counter-clockwise in key-releasingdirection, as explained above, also causes a stud 487, carried by saidlever, in cooperation with a slot in a forward extension of a lever 488(FIG. 17) free on a stud 1489 secured in the left frame, to rock saidlever 488 clockwise. Clockwise movement of the lever 488 causes a raisedsurface 489 thereon to engage the stud 480 and rock the pawl 481counter-clockwise, against the action of the spring 483, to move thedownward extension 484 of said pawl out of engagement with and out ofthe path of the surface 485 on the lever 452, whereupon said lever, thearm 450, and the shaft 139 are spring-returned a slight distancecounter-clockwise and clockwise, respectively, to home or untrippedposition. upon return of the release lever 115 clockwise to normalposition.

Release of the depressed Row 2 control key, as explained above, freesthe detent 269, the arm 313 (FIG. 2), and connected parts for restoringmovement under control of the mechanism shown in FIG. 4 and explainedearlier herein, when it functions near the end of the next or succeedingmachine operation. However, prior to operation of the machine, thedetent 269, the arm 313, and connected parts (FIG. 2) will remain innon-repeat position, and it will be impossible to initiate a repeatoperation of the machine, thus requiring that the amount of thetransaction be set up on the amount keys 103 and that a non-repeatoperation be performed.

Summarizing briefly, the mechanisms disclosed in FIGS. 10 to 17,inclusive, function in connection with the repeat mechanism to preventmal-operation of the machine, with the resulting possible damage to themachine mechanism, when a Row 2 control key is retained depressed at theend of a repeat operation, or is prematurely depressed before the end ofsaid operation, or when a Row 2 control key is retained depressed at theend of a non-repeat operation or is prematurely depressed prior to theend of said operation.

When a Row 2 control key 109, 110, 111, or 112 or the Grocery key 106 isretained depressed at the end of a repeat operation, the arm 460 (FIG.14) is retained in the position shown here. If, in the immediatelysucceeding operation, an amount key 103 is depressed, the arm 471 isrocked to the position shown in full lines in FIG. 15

and in dot-and-dash lines in FIG. 14, to move the finger.

456 into alinement with the raised surface 458, thereby preventingreleasing movement of the shaft 139, and thus preventing a mal-operationof the machine. Likewise, if one of the above-mentioned control keys isretained depressed at the end of a repeat operation, the arm 460 isretained in the position shown in FIG. 14, and if immediately thereaftera totalizing operation is attempted by depression of the Sub-Total key105, the Taxable Total key 107, the Cash Total key 108, or a Paid-Outoperation is attempted by depression of the Paid-Out key 104, themechanism shown in FIGS. 5 and 6, and explained earlier, rocks the arm471 to the position shown in FIGS. 14 and 15, exactly the same asdepressing an amount key, to cause the finger 456 to be moved into thepath of the blocking surface 458 on said arm 460, to obstruct releasingmovement of the shaft 139 and thereby prevent operation of the machineunder these conditions.

If at the end of a non-repeat (adding) operation one of the Row 2control keys 109 to 112 inclusive, or the Row 1 control key 106, isretained depressed, the pawl 481 (FIG. 16) becomes effective at the endof such operation to retain the lever 452, the arm 450, and the shaft139 in restored position, and thus obstruct releasing movement of saidparts in the immediately succeeding operation, until the key releaselever 115 is operated to move said pawl to ineffective position, and tosimultaneously release the depressed control key.

If one of the above-mentioned control keys is retained depressed at theend of a repeat operation, movement of the total control lever 116 awayfrom Register position, in either direction, functions through themechanism shown in FIG. 7, and explained earlier, to rock the arm 471 tothe position shown'in FIGS. 14 and 15, in which the finger 456 is in thepath of the obstructing surface 458, to prevent releasing movement ofthe shaft 139 under this condition.

Operation It is believed that a full understanding of the operation ofthe machine will have been obtained from a perusal of the precedingdescription. However, a brief description of the operation and the useof the machine may be helpful and will now be given.

The machine disclosed in the present application is suitable for thesame general business applications as machines of a similar typedescribed and illustrated in the previously-mentioned United Statesapplication Serial No. 412,464, now Patent No. 2,962,209, except thatthe present machine is enhanced in value and utility by the inclusion ofa novel repeat mechanism which makes it possible for the operator torepeat the amount of an -the item totalizer.

23 item Without knowing at the time that said amount is to be repeated.l

During a multiple-item transation, if the operatornotes from the amountindicators that the amount of the last preceding item is the, sameas'the amount of the present item to be entered into the machine,all'that is necessary is to depress the appropriate transaction orcontrol key for the next item, and the amount of the last preceding itemwill be automatically repeated and entered intothe machine totals andindicated and recorded, without the necessity of setting up said item onthe amount keys.

It is not necessary thatthis repeat item be in the same category orclass as the preceding item in order to effect a repeat operation. Allthat is necessary is that the amount of the items be the same. Forexample, let it be assumed that the preceding item-was a package of meatpriced at $1.50, which is entered into the machine by depressing theappropriate amount keys 103, and then depressing theMetal transactionkey 109 (FIG. 9), which initiates a machine operation during which theamount of the meat item, $1.50, is indicated and recorded andsimultaneously accumulated in the meat totalizer and in Then let it beassumedthat the next item is a Grocery item, also priced at $1.50. Toenter this second item, the operator depresses the Grocery transactionkey 106, which initiates a machine operation during which the Groceryitem of $1.50 is indicated and recorded and is simultaneouslyaccumulated in the Grocery totalizer and in the item totalizer. Theoperator may continue to repeat this amount for subsequent item entriesso long as the amount of the item is the same as that of the precedingitem.

It will be recalled that depression of an amount key during itspreceding operation.., Similarly, depression of the Paid-Out key 104disables the repeat mechanism, so

i I that a repeat operation cannot be initiated by depression of saidPaid-Out key. As has been stated, a Paid-Out operation differs from atotal-taking operation in that an amount is entered into the machine byuse of the appropriateamount keys 103 in conjunction with the use of thePaid-Out key 104.

Furthermore, depression of any of the control .keys 104, 105, 107, or108, or movement of the total control lever 116 out of Registerposition, causes the repeat disabling means tobe latched in repeatdisabling position, so that the succeeding operation is prevented frombeing a repeat operation. Therefore, it will be seen that the machinehas been so constructed and arranged as to permit the use of the repeatmechanism only for repeating previously-entered item amounts inmultiple-item transactions.

. Repeat control mechanism is provided for preventing operation of themachine in case one of the Row 2 conone ofthe above-mentioned controlkeys is retained depressed at the end of a repeat operation, to preventthe initiation of a subsequent sub-total or totaloperation.

by use of the Rowl control keys 105, 107, or 108. This preventsmal-operation of the machine and the danger ofdamage to the wheels ofthe selected totalizers, caused lay-forcefully rotating them in areverse direction beyond zero position, which would result in damagecaused to 24 the long zero teeth on said wheels or damage to theassociated differential mechanism.

The repeat control mechanism also functions, when one of the Row 2control keys 109-112 inclusive or the Grocery key 106 is retaineddepressed at the end of moving the total control lever 116 out ofRegister posi-' tion operates through the mechanismshown in FIGS. 7 and15 to move the finger 456 into the path of the obs'tructing surface 458,to preventloperation of the machine until this erroneous condition isremedied.

. Whilethe form of mechanism herein shown and described is admirablyadapted to fulfill the objects primari- -ly stated, it is to beunderstood that it is not intended to confine the invention to the oneform or embodiment disclosed herein, for it is susceptible of embodimentin various other forms, all coming within the scope and spirit of theinvention.

What is claimed is:

1. In a machine of the class described, constructed and arranged toperform amount repeating and amount nonrepeating operations, and havingamount keys to set up amounts, the combination of a plurality of controlkeys to initiate amount repeating. and amount nonrepeating operations;and means controlled jointly by the amount keys and the control keys, toprevent operation of the machine when one of said control keysisretained depressed at the endof an amount repeating'operation, and

"an amount-key is subsequently operated to condition the machine for anamount non-repeating operation.

' 2. In a machine of the class described, capable of conditioning meansand thus to condition the machine for a non-repeat operation;depressible control keys to initiate repeat and non-repeat operations;and means operations, and having amount keys to set up amounts, the

combination of depressible control keys to initiate repeat andnon-repeat operations; means operated by the control'keys to release themachine for operation; a sensing member on the releasing means;.acontrol member constructed and arranged to coactwith the sensing memberto control operation of the releasing means; and means renderedefiective when a control key is retained depressed at the end of arepeat'operation, and an amount key is subsequently depressed tocondition the machine for a non-repeat operation, to move the sensingmember relatively tothe control member to obstruct operation of thereleasing means to prevent mal-operation of the machine.

4. In a machine. of the class described, capable of amount repeating andamount non-repeating operations, and having depressible amount keystoset up amounts, the combination of operable means to release the machinefor an operating cycle, said releasing'means constructed and arranged tobe automatically restored to unoperated condition near the end of eachoperating cycle; depressible control keys to operate the releasingmeans; means normally effective to condition the machine for a repeatoperation; means operable by depression of an amount key to render therepeat conditioning means ineffective, and thus to condition the machinefor a non-repeat operation; means including a part rendered effective bythe repeat conditioning means when a control key is retained depressedat the end of a non-repeat operation to obstruct operation of thereleasing means to prevent mal-operartion of the machine; andmanually-operable means to move the part out of obstructing relationshipwith the releasing means to free said releasing means for operation.

5. In a machine of the class described, capable of performing amountrepeating and amount non-repeating operations, and having depressibleamount keys to set up amounts to be repeated, the combination of meansto release the machine for an operating cycle; depressible control keysto operate the releasing means; a sensing finger on the releasing means;a control member constructed and arranged to coact with the sensingfinger, said sensing finger and said control member positionable inrelation to each other to control the operation of the releasing means;means effective when the machine is properly conditioned for either arepeat operation or an non-repeat operation to position the controlmember and the finger in proper relationship with each other, so thatthe releasing means is free to operate; and means whereby retaining acontrol key depressed at the end of a repeating operation, anddepressing an amount key to condition the machine for a non-repeatoperation moves the finger out of proper relationship with the controlmember to prevent operation of the machine-releasing means.

6. In a machine of the class described, capable of amount-enteringoperations and amount-repeating operations; and having depressibleamount keys to set up amounts to be entered, the combination of meanseffective upon being operated to release the machine for an operatingcycle, said releasing means constructed and arranged to be automaticallyrestored to unoperated condition near the end of each machine operatingcycle; means including depressible control keys to operate the releasingmeans; repeat and non-repeat conditioning means, positionable in repeatand non-repeat positions, said means norm-ally in repeat position andwhen in repeat position operable by depression of a control key to causethe machine to perform a repeat operation; means operable by depressionof an amount key to move the repeat and non-repeat conditioning meansfrom repeat position to non-repeat position, whereupon depression of acontrol key causes the machine to perform a non-repeat operation;non-positive restoring means eflective when no control key is retaineddepressed at the end of a non-repeat operation to restore the repeat andnon-repeat conditioning means from non-repeat to repeat position nearthe end of said non-repeat operation; means including a part renderedeffective by the repeat and non-repeat conditioning means when retainedin non-repeat position by a depressed control key, and by the releasingmeans when restored to unoperated condition, to hold said releasingmeans in said unoperated condition to prevent mal-operation of themachine; and manually-operable means to move the part to ineffectiveposition to free the releasing means for operation.

7. In a machine of the class described, capable of amount-enteringoperations and amount-repeating operations, and having depressibleamount keys to set up amounts to be entered, the combination of meanseffective upon being operated to release the machine for an operatingcycle, said releasing means constructed and arranged to be restored tounoperated condition at the end of each operating cycle; depressiblecontrol keys to operate the releasing means; means actuated bydepression of a control key to condition the machine for amountrepeatingoperations; means actuated by depression of an amount key to alter thecoacting relationship between the repeat-conditioning means and thecontrol keys to cause said conditioning means to condition the machinefor an amount-entering operation; non-positive means effective near theend of each opeuating cycle to restore the repeatconditioning means fromaltered condition to repeat condition, said restoring means ineffectiveto restore said repeat-conditioning means when a control key is retaineddepressed at the end of an amount-entering operation; means including apart rendered effective by the repeatconditioning means when saidrepeat-conditioning means is retained against restoring, and by thereleasing means when restored to unoperated condition to obstructoperation of said releasing means to prevent mal-operation of themachine; and manually-operable means to move the part out of obstructingrelationship with the releasing means to free said releasing means foroperation.

References Cited in the file of this patent UNITED STATES PATENTS

